最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Wei ZHOU Qiaogen WANG Hongfei LU Jie
        Vol. 33, Issue 11, (2010)
        摘要：The 3-dimensional Hall probe composed of three planar hall sensors is a popular method to measure magnetic fields with high precision.But the non-alignment and non-orthogonality between the three hall sensors will influence the accuracy of the magnetic field measurement,and must be calibrated in advance.Various types of periodic magnetic fields provided by EPU 100,a variable elliptical polarizing undulator of APPLE-II structure at Shanghai Synchrotron Radiation Facility(SSRF),was used to calibrate the non-orthogonality between the three hall sensors of a 3D hall probe.In this paper,we describe the method and the procedure of the calibration in detail.  
        关键词：3D Hall-probe;Calibration;Elliptically polarizing undulator EPU100   
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        发布时间：2021-03-05
      • HUANG Guoqing CHEN Jie CHEN Zhichu LENG Yongbin YE Kairong
        Vol. 33, Issue 11, (2010)
        摘要：Beam emittance is an important parameter for a third-generation synchrotron light source.In this paper,we report design of an X-ray pinhole camera to measure emittance of SSRF.It is composed of the front-end,attenuator,pinhole,YAG target,camera and PXI controller.The software was developed on LabVIEW platform to communicate with accelerator control system via EPICS Shared Memory IOCcore interface.The front-end have been in use safely since August 2009,and the temperature of the emitted window does not exceed 36°C at 300 mA.And the X-ray pinhole camera system works reliably in measuring the beam emittance of just 3.9 nm·rad.  
        关键词：SSRF;X-ray pinhole camera;EPICS;Emittance   
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        发布时间：2021-03-05
      • WU Li LI Wenjing LU Jiao JIN Huiming ZHANG Qing YUAN Pingjun FANG Guoping
        Vol. 33, Issue 11, (2010)
        摘要：This article presents the facility cooling water system of the project,and puts emphasis on how to utilize the equipments such as cooling tower,refrigerating unit,electrical heater,bypass valve etc,and arrange the control flow in different situation of the accelerator when designing and debugging its temperature control system,thus save as much energy as possible.The system is proved to satisfy the design requirements under the precondition of energy-saving by examples.  
        关键词：SSRF;Cooling water;Temperature control;Energy saving measures   
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        发布时间：2021-03-05
      • ZHOU Guangying 1,2 YAN Long1 Ishaq Ahmad1,2 HE Suixia1 ZHOU Xingtai1 1
        Vol. 33, Issue 11, (2010)
        摘要：A method to improve electrical conductivity of carbon nanotube(CNT) networks by ion implantation is reported in this paper.MWCNT networks were prepared by a spray coating method,and were implanted with 70 keV Ar+ ions.The electrical conductivity increased by ～80% for the MWCNT networks irradiated to 2×1016/cm2 at 800 K.The results confirm the ability of ion beam to improve the electronic contact by inducing crosslink between CNTs under ion beam irradiation.This is a useful method to fabricate high conductive and transparent CNT networks.  
        关键词：Multiwalled carbon nanotubes;Ion beam irradiation;Conductivity   
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        发布时间：2021-03-05
      • YANG Bin YAN Yongjun ZHOU Jianliang
        Vol. 33, Issue 11, (2010)
        摘要：In this paper,we present three methods of digital filter to nuclear signals:Gaussian shape filtering,matched shape filtering,and trapezoidal shape filtering.A digital simulative generator for nuclear radiation signals has been designed as signal source.The filtering results were studied by changing the input time of single-index signals and filtering parameters.  
        关键词：Nuclear signals;Digital simulation;Digital filter   
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        发布时间：2021-03-05
      • XIA Yanfang XIAO Yongjun HU Chuangye LIU Lin ZHEN Xianli
        Vol. 33, Issue 11, (2010)
        摘要：Molecular magnet nickel(Ⅱ) hexacyanoferrate(Ⅲ) powder,Ni3[Fe(CN)6]2·16.5H2O,was prepared by co-precipitation method,and the co-precipitated powder was treated at room temperature,100 oC and 160 oC.It possessed a face-centered cubic(FCC) crystal structure with lattice constant of around 10 .For the freeze-dried sample,the structure was mainly FeⅢ-CN-NiⅡ,with a minor amount of FeⅡ-CN-NiⅢ structure;while for the cyanide annealed at higher temperatures,the FeIII-CN-NiII structure was gradually converted to FeⅡ-CN-NiⅢ,indicating phase transformation during the annealing.  
        关键词：Cyano-bridged compound;Heat induced;Phase transformation;Mssbauer Spectrum   
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        发布时间：2021-03-05
      • ZHUO Jun NIU Shengli ZHU Jinhui HUANG Liuxing
        Vol. 33, Issue 11, (2010)
        摘要：Backscattering coefficients of low energy electron beams impinging on ultra-thin films on a substrate were simulated with Monte Carlo code.All the interaction events experienced by single electron were simulated in chronological succession.The dependence of backscattering coefficient,r,on thickness of the thin film,D,was calculated and analyzed.The results show that there is one linear range,and the slope C of the linear range will arises until it reaches a maximum value while the energy of impinging electron decreases.This will provide reference for energy of incidence electron selection in ultra-thin film measurement.  
        关键词：Low energy electron;Backscattering coefficient;Detailed Monte Carlo simulation;Ultra-thin film   
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        发布时间：2021-03-05
      • LI Qiang1 GAO Jie2 LIU Weixin3 1
        Vol. 33, Issue 11, (2010)
        摘要：In this article,the relationship between static SEU(Single Event Upset) rate and dynamic SEU rate of microprocessor for satellites is studied by using process duty cycle concept,in an attempt to predict the dynamic SEU rate.By combining the probability of microprocessor for satellites,which meets the requirement of SEU rate,with the SEU rate and flight period,the prediction method of device-level and system-level anti-SEU reliability are given.  
        关键词：Microprocessor for satellites;SEU rates;Process duty cycle;Anti-SEU reliability   
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        发布时间：2021-03-05
      • CHEN Changchun LIU Jiangfeng YU Benhai WANG Lin
        Vol. 33, Issue 11, (2010)
        摘要：HfNx sample was grown on SiO2/Si substrate by metal organic chemical vapor deposition(MOCVD).Rutherford backscattering spectrometry(RBS),X-ray powder diffraction(XRD) and X-ray reflectivity(XRR) were used to characterize the HfNx thin film.The results showed that the ratio of N atoms to Hf atoms in the HfNx thin film was around 1.15,and the HfNx thin film,with a smooth surface and an interface of small roughness on the substrate,was a polycrystalline thin film grown preferentially along the(111) crystal direction.  
        关键词：MOCVD;HfN thin film;RBS;XRD   
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        发布时间：2021-03-05
      • ZHANG Haiqing NI Bangfa TIAN Weizhi WANG Pingsheng HUANG Donghui ZHANG Guiying LIU Cunxiong XIAO Caijin SUN Hongchao ZHAO Changjun
        Vol. 33, Issue 11, (2010)
        摘要：MCNP code was used to simulate the detection efficiencies for different γ-ray energies at different source positions.The widely used expression on radial variation of HPGe detector’s γ-ray efficiency for point source proposed by Masayasu et al.[1] was amended and a new expression was proposed.A comparison between calculated and measured results indicates that the newly extracted expression brings about an obvious improvement.The expression in this work and the MCNP simulation method are both conducive to the study on HPGe detector’s γ-ray efficiency measurement and calculation for bulky sources.  
        关键词：HPGe detector;Point radioactive source;MCNP simulating method;Detecting efficiency   
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        发布时间：2021-03-05
      • GE Liangquan GU Yi ZHANG Qingxian MA Yonghong CHENG Feng
        Vol. 33, Issue 11, (2010)
        摘要：The radon background correction is a crucial step in data processing of airborne gamma-ray spectrometry.In this article,we report the theory and mathematic model of spectral-ratio method to correct radon background in natural gamma-ray spectrometry.The relationship between survey height and calibration coefficients of terrestrial component spectra is analyze.The calibration coefficients can be obtained experimentally,and possible problems in spectral mathematical fitting can be avoided.  
        关键词：Airborne gamma-ray spectrometry;Radon background correction;Component spectrum;Calibration coefficient   
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        发布时间：2021-03-05
      • WU Wensheng XIAO Lizhi
        Vol. 33, Issue 11, (2010)
        摘要：In this paper,Monte Carlo simulation is used to calculates thin bed responses for different detector spacings of longer than zero spacing,the relationships between photon flux and spacing at various formation densities,and the "spine-rib" figures for long,middle and short spacings.The results show that the spacing affects the longitudinal resolution,statistical error,sensitivity,and mudcake compensation effect of density logging tool.For a density logging tool of high-resolution(20 cm) and high measurement precision,the long,middle and short spacing should be about 38,20.5 and 11 cm,respectively.  
        关键词：Three-detector density logging;Spacing optimization;Longitudinal resolution;Measurement precision   
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        发布时间：2021-03-05
      • LIANG Xun LIU Dewen
        Vol. 33, Issue 11, (2010)
        摘要：In this paper,for space application of the interference fiber optic gyroscope(IFOG),radiation effect on polarization-maintaining fibers irradiated by 60Co γ-rays to different total doses at different dose rates is studied,and a mathematic relationship between the radiation-induced performance loss of the polarization-maintaining fiber and the dose rate is established.The losses were 1.0,0.55 and 5.8 dB for total doses of 63,32 and 326 Gy at dose rates of 0.01,0.02 and 0.0835 Gy/s,respectively.These show that the performance loss of the polarization-maintaining fibers increases with the dose rate and the total dose.The theoretical analysis,which well interprets the experimental data,provides references to ground tests of the radiation effect on polarization-maintaining fibers for space applications.  
        关键词：Polarization-maintaining fiber;Radiation effect;Fiber radiation effect experiment   
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        发布时间：2021-03-05
      • SHEN Le1 XING Yuxiang1,2 1
        Vol. 33, Issue 11, (2010)
        摘要：The derivative back-projection filtered algorithm for a helical cone-beam CT is a newly developed exact reconstruction method.Due to its large computational complexity,the reconstruction is rather slow for practical use.General purpose graphic processing unit(GPGPU) is an SIMD paralleled hardware architecture with powerful float-point operation capacity.In this paper,we propose a new method for PI-line choice and sampling grid,and a paralleled PI-line reconstruction algorithm implemented on NVIDIA’s Compute Unified Device Architecture(CUDA).Numerical simulation studies are carried out to validate our method.Compared with conventional CPU implementation,the CUDA accelerated method provides images of the same quality with a speedup factor of 318.Optimization strategies for the GPU acceleration are presented.Finally,influence of the parameters of the PI-line samples on the reconstruction speed and image quality is discussed.  
        关键词：X-ray optics;CT reconstruction;BPF;PI-lines;GPGPU;CUDA   
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        发布时间：2021-03-05
      • KONG Yang WU Jie MA Yichao HAN Zhao
        Vol. 33, Issue 11, (2010)
        摘要：A stable high-efficient high speed transmission solution is important for a network with a huge number of sensors and a high data rate requirement.Gigabit ethernet using unshielded twisted cable as its transmission medium can reach up to 100 meters on Category 5 line.According to this,we realized a high speed transmission solution based on gigabit ethernet PHY transceiver.High speed switch block is implemented in a field-programmable gate array to switch MAC data frames between different ports.This solution not only transmits frame at a high data rate but also handles them by FPGA.The data rate in this structure is much higher than the traditional CPU + MAC controller + PHY structure.Experimental results show that the gigabit Ethernet-based high speed transmission solution works efficiently in large sensor networks.  
        关键词：Sensor networks;Gigabit ethernet;Field-programmable gate array;Data transmission   
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        发布时间：2021-03-05
      • SHE Qianshun ZHAO Hongyun SU Hong MA Xiaoli LI Xiaogang
        Vol. 33, Issue 11, (2010)
        摘要：A long-time current integration digitizer was developed for monitoring ion beams of the Heavy Ion Research Facility at Lanzhou(HIRFL).A simple and practical method for current/frequency conversion was adopted,combined with a counter and processor.Being able to measure input currents of 10 pA?10 μA,the long-time digital current integration instrument can be used for testing current or electrical charge from the ionization chamber,Faraday cup and other weak current sources.The time of measurement can be selected from 1 second to 192 hours(8 days).The instrument can be operated in one cycle mode and recycle mode.A feasible,general,and cost-effective way for long time test of current or electrical charge was presented.  
        关键词：Current integration;Current to frequency conversion;Digitizer   
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        发布时间：2021-03-05
      • LI Jing1,2 ZHU Ying1 ZHANG Xiaoyong1,2 LI Wenxin1 HUANG Qing1 1
        Vol. 33, Issue 11, (2010)
        摘要：A multifunctional drug delivery system based on nanodiamonds(NDs) has been developed.FITC,HCPT and TF were absorbed on NDs successively to form the multifunctional complex.The NDs and ND complex samples were characterized by TEM,FR-IR and UV-V.The results indicated that this drug delivery system is a high loading system.Efficacy of the drug delivery system on Hela cell was evaluated with MTT assays and fluorescence microscopy.The results show that multifunction of the NDs complex include fluorescence,targeting and high efficacy.  
        关键词：Nanodiamonds;Carrier;Drug delivery;Targeting;Fluorescence   
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        发布时间：2021-03-05
      • YANG Guojun ZHANG Zhuo LI Weifeng ZHANG Kaizhi SHI Jinshui
        Vol. 33, Issue 11, (2010)
        摘要：These years,a new type of accelerator,namely induction synchrotron,has been a focus of improving the intensity of high energy ion beams.Combining the advantages of radio-frequency synchrotron and linear induction accelerator,an induction synchrotron may improve the performance of accelerators evidently.As a key factor to determine the principle of acceleration,the longitude dynamics of the accelerators should be studied first.In some aspect,the longitude dynamics of induction synchrotron is similar to a radio-frequency synchrotron,but it has some unique characteristics.In this paper,the longitude dynamics of induction synchrotron is analyzed.The software of ISync,based on multi-particle tracing,is programmed to simulate the longitude dynamics.The simulation results are in accordance with the theoretical analysis.The aberration and oscillation of time spectrum are discovered in the simulation.The origin of the phenomena is analyzed,and ways of suppressing the phenomena are proposed.The work can be of help for future works on induction synchrotron.  
        关键词：Induction synchrotron;Longitude dynamics;Aberration of time spectrum;Oscillation of time spectrum   
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        发布时间：2021-03-05
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